Keys to distinguish between Impatiens tricornis Lindl. and Impatiens edgeworthii Hook. f.

[Ashutosh Sharma]

Respected members,

I am making this post to clear differences between Impatiens tricornis Lindl.(Synonyms - I. scabrida  [sensu Hara (1979) and  Akiyama  et al.  (1991, 1992)]) and Impatiens edgeworthii Hook. f.

The darker yellow color form of Impatiens tricornis can be/is confused with Impatiens edgeworthii because of near similar yellow color but the key differences between the two species are - 

1) In I. edgeworthii upper lobes of lateral united petals are prolonged and obliquely upwards while in I. tricornis these are much broader and never curves upward. 

2) In I. edgeworthii lower sepal is infundibuliform, gradually narrowed into a long recurved spur while in I.tricornis it is  bucciniform to funnel-shaped and abruptly constricted into the spur. 

3) The flower of I. edgeworthii is streaked red in the throat including upper lobe and half lower lobe of lateral united petal while in I. tricornis it is never streaked red though some rusty spots occur in the throat. 

4) I. edgeworthii is glabrous including its capsules while I.tricornis is much hairy (pubescent) in nature though in lower altitude its less hairy form with much white flower also occurs but capsule remains puberulent in that also. 

Please see the attached images for clearing differences ... 

Note - Most(not all) of the Impatiens scabrida DC. that we know earlier is actually Impatiens tricornis Lindl. characterised by its bucciniform  to funnel-shaped lower sepal abruptly  constricted  into  the  spur while in true I. scabrida DC. lower sepal is navicular and tapers into a spur.

Best regards 

Ashutosh Sharma 

[Saroj Kasaju]

That means I.scrabida and I edgeworthii are syn of I.tricornis, is it ?

Thank you.

Saroj Kasaju

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[J.M. Garg]

Thanks a lot, Ashutosh ji.

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With regards,
J.M.Garg

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Winner of Wipro-NFS Sparrow Awards 2014 for efloraofindia. 

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[ashutoshsharma11sn]

No Saroj ji Impatiens scabrida DC., Impatiens tricornis Lindl. and Impatiens edgeworthii Hook.f. all three are distinct species and accepted names...

In this post i have cleared a lot of major differences between Impatiens tricornis and Impatiens edgeworthii.

Impatiens tricornis is much variable species with dark yellow flowers and hairy plant in higher altitude and also white flowers with very less hairy plant form in lower altitudes...

Please go through the paper of Dr. Shinobu Akiyama mam 'Studies of Impatiens (Balsaminaceae) of Nepal 3. Impatiens scabrida and Allied Species' there you can find good illustrations and much details to distinguish I. tricornis and I. scabrida...

Most of the post on our group under name I.scabrida is actually I. tricornis however i am currently checking if there is any image of true I. scabrida DC. present on our group or not...

Best regards
Ashutosh Sharma

[J.M. Garg]

Thanks, Ashutosh ji.

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[Gurcharan Singh]

Thanks Garg ji for key and attachments. The crucial question is whether our specimens with suddenly tapered lower sepal is I. scabrida or I. tricornis if we treat them distinct species. the confusion all along has been status of I. tricornis. If we believe (as per Paper by Shinobu Akiyama and Hideaki Ohba) that specimens with "Lower sepal navicular or infundibuliform, 9–12 mm long, 5.5–8 mm deep (excluding the spur), tapering into a long upwardly or downwardly curved spur; spur 17–25 mm in overall length". are I. scabrida (No known Indian distribution according to these authors), and "Lower sepal pale yellow shaded with dull orange, bucciniform, (9–)15–18 mm long, (13–)20–25 mm deep (excluding the
spur), abruptly constricted into incurved spur; spur curved, (8–)15–23 mm in overall length" is I. tricornis, we need to have key separating I. edgeworthii and I. scabrida as per new interpretation of these authors. This only will settle the matter for all. Until we have key separating all three matter can't be solved.

Dr. Gurcharan Singh

Retired  Associate Professor
SGTB Khalsa College, University of Delhi, Delhi-110007
Res: 932 Anand Kunj, Vikas Puri, New Delhi-110018.
Mob: 9810359089

https://sing96.wixsite.com/mysite-1

[J.M. Garg]

Thanks, Singh ji.